1 files changed, 120 insertions, 0 deletions
diff --git a/include/linux/pps_kernel.h b/include/linux/pps_kernel.h
new file mode 100644
index 000000000..78c8ac495
--- /dev/null
+++ b/include/linux/pps_kernel.h
@@ -0,0 +1,120 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * PPS API kernel header
+ *
+ * Copyright (C) 2009   Rodolfo Giometti <giometti@linux.it>
+ */
+
+#ifndef LINUX_PPS_KERNEL_H
+#define LINUX_PPS_KERNEL_H
+
+#include <linux/pps.h>
+#include <linux/cdev.h>
+#include <linux/device.h>
+#include <linux/time.h>
+
+/*
+ * Global defines
+ */
+
+struct pps_device;
+
+/* The specific PPS source info */
+struct pps_source_info {
+	char name[PPS_MAX_NAME_LEN];		/* symbolic name */
+	char path[PPS_MAX_NAME_LEN];		/* path of connected device */
+	int mode;				/* PPS allowed mode */
+
+	void (*echo)(struct pps_device *pps,
+			int event, void *data);	/* PPS echo function */
+
+	struct module *owner;
+	struct device *dev;		/* Parent device for device_create */
+};
+
+struct pps_event_time {
+#ifdef CONFIG_NTP_PPS
+	struct timespec64 ts_raw;
+#endif /* CONFIG_NTP_PPS */
+	struct timespec64 ts_real;
+};
+
+/* The main struct */
+struct pps_device {
+	struct pps_source_info info;		/* PSS source info */
+
+	struct pps_kparams params;		/* PPS current params */
+
+	__u32 assert_sequence;			/* PPS assert event seq # */
+	__u32 clear_sequence;			/* PPS clear event seq # */
+	struct pps_ktime assert_tu;
+	struct pps_ktime clear_tu;
+	int current_mode;			/* PPS mode at event time */
+
+	unsigned int last_ev;			/* last PPS event id */
+	wait_queue_head_t queue;		/* PPS event queue */
+
+	unsigned int id;			/* PPS source unique ID */
+	void const *lookup_cookie;		/* For pps_lookup_dev() only */
+	struct cdev cdev;
+	struct device *dev;
+	struct fasync_struct *async_queue;	/* fasync method */
+	spinlock_t lock;
+};
+
+/*
+ * Global variables
+ */
+
+extern const struct attribute_group *pps_groups[];
+
+/*
+ * Internal functions.
+ *
+ * These are not actually part of the exported API, but this is a
+ * convenient header file to put them in.
+ */
+
+extern int pps_register_cdev(struct pps_device *pps);
+extern void pps_unregister_cdev(struct pps_device *pps);
+
+/*
+ * Exported functions
+ */
+
+extern struct pps_device *pps_register_source(
+		struct pps_source_info *info, int default_params);
+extern void pps_unregister_source(struct pps_device *pps);
+extern void pps_event(struct pps_device *pps,
+		struct pps_event_time *ts, int event, void *data);
+/* Look up a pps_device by magic cookie */
+struct pps_device *pps_lookup_dev(void const *cookie);
+
+static inline void timespec_to_pps_ktime(struct pps_ktime *kt,
+		struct timespec64 ts)
+{
+	kt->sec = ts.tv_sec;
+	kt->nsec = ts.tv_nsec;
+}
+
+static inline void pps_get_ts(struct pps_event_time *ts)
+{
+	struct system_time_snapshot snap;
+
+	ktime_get_snapshot(&snap);
+	ts->ts_real = ktime_to_timespec64(snap.real);
+#ifdef CONFIG_NTP_PPS
+	ts->ts_raw = ktime_to_timespec64(snap.raw);
+#endif
+}
+
+/* Subtract known time delay from PPS event time(s) */
+static inline void pps_sub_ts(struct pps_event_time *ts, struct timespec64 delta)
+{
+	ts->ts_real = timespec64_sub(ts->ts_real, delta);
+#ifdef CONFIG_NTP_PPS
+	ts->ts_raw = timespec64_sub(ts->ts_raw, delta);
+#endif
+}
+
+#endif /* LINUX_PPS_KERNEL_H */